Psych 301 Quiz 4

Front 1

If events A and B are independent, then p(A and B)=

Back 1

p(A or B)

Front 2

Two events are mutually exclusive if

Back 2

they both cannot occur together

Front 3

Captain Kirk and Mr. Spock are engaged in a 3-D backgammon playoff, a game employing 6 dice. Kirk asks Spock the probability of rolling the dice and observing 6 sixes. Assume the dice are not biased. Spock's correct a priori* reply is

Back 3

one-sixth to the sixth power (1/6)^6

Front 4

If the mean of a distribution is 35.2 and the standard deviation is 10, then the probability that X is less than or equal to 39 is.....assume random sampling

Back 4

.6480

Front 5

If the probability of drawing a member of a population is not equal for all members, then the sample is said to be

Back 5

biased

Front 6

The binomial expansion equals

Back 6

(P+Q)^N

Front 7

Assume the binomial distribution is appropriate. If N=10 and P=.30, the probability of getting at least 8 P events is

Back 7

.0015

Front 8

Consider the binomial expansion for 6 events:
P^6+6P^5Q+15P^4Q^2+20P^3Q^3+15P^2Q^4+6PQ^5+Q^6

What term would you use in evaluating the probability of obtaining exactly 2 heads as the result of flipping an unbiased coin 6 times?

Back 8

15P^2Q^4

Front 9

The sum of all terms in any binomial expansion will equal

Back 9

1

Front 10

In one flip of 10 unbiased coins, what is the probability of getting a result as extreme or more extreme than 8 heads?

Back 10

.1094

Front 11

The nondirectional alternative hypothesis asserts that

Back 11

the independent variable has an effect

Front 12

An alpha level of .05 indicates that**

Back 12

if Ho is true, the probability of falsely rejecting it is limited to .05

Front 13

If the alternative hypothesis states that alcohol affects short-term memory, the null hypothesis states

Back 13

alcohol has no effect on short-term memory

Front 14

In an experiment involving a nondirectional alternative hypothesis, the obtained result was 7 pluses and 1 minus. To evaluate the null hypothesis, which of the following probabilities would you use?

Back 14

p(0)+p(1)+p(7)+p(8)

Front 15

If you reject the null hypothesis, what type of error might you be making?

Back 15

Type 1